Migrate from constance to dynamic-preferences

Rationale: django-dynamic-preferences allows defining global preferences and "instance preferences", i.e. user preferences, the same way. It is also way more sophisticated than constance and provides more possibilities for preference fields as well as rendering options.

Closes #162 (closed), advances #214 (closed) and others.

changed milestone to %2.0a2

added part::backend label

mentioned in merge request !215 (closed)

added 150 commits

• 553ba953...7d9a57fc - 149 commits from branch master
• b9cd0a08 - Merge branch 'master' into feature/dynamic-preferences

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added 5 commits

• 1645d398 - CHange config_updated signal handle to preference_updated
• 9d472638 - Fix typo
• 8ad4abc2 - Rename lazy_config to lazy_preference and add section as argument
• bbb59cc0 - Fix missed rename
• a456a860 - Replace constance in sass helpers and models

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added 1 commit

• 87637abc - Fix missing bits for migration to dynamic_preferences

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Is there anything left to do?

added 1 commit

• cb79f536 - Set field_class with Field object instead of widget with Field object in preferences

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added 1 commit

• 5f57b7a5 - Fix use of some preferences

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added 23 commits

• 5f57b7a5...dd7a8710 - 22 commits from branch master
• 1d83ef51 - Merge branch 'master' into feature/dynamic-preferences

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added 1 commit

• 61ee0287 - Update templates

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added 1 commit

• 218818de - Move School attributes to site preferences and introduce all registries

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added 5 commits

• 7ca999f6 - Fix model fields
• d9a24816 - Drop School and SchoolTerm from admin.py
• e17aa3ff - Drop School stuff
• db3dc8bc - Add meta class
• 894b50c9 - Add migration

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added 1 commit

• ddbb91fd - Fix access to site preferences

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added 1 commit

• 34d4ee36 - Fix typo

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added 4 commits

• 744f3a6c - FIx get_current_site call
• 20e393b5 - Move remaining parts to site preferences
• 62bd0327 - Determine site by SITE_ID only
• a71aa354 - Remove stray code

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added 3 commits

• 528f3c27 - Move import from Site
• 5e1b6c6a - Get site preferences
• e1cc2a46 - Fix import

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added 33 commits

• aefbade8 - Translate constance configs to dynamic preferences
• 1ae4215c - CHange config_updated signal handle to preference_updated
• d139058c - Fix typo
• 2229692f - Rename lazy_config to lazy_preference and add section as argument
• bfe78906 - Fix missed rename
• c23f1224 - Replace constance in sass helpers and models
• 3f901408 - Fix missing bits for migration to dynamic_preferences
• 256e3864 - Set field_class with Field object instead of widget with Field object in preferences
• d2a359bb - Fix use of some preferences
• 676f9548 - Update templates
• 5997caf8 - Move School attributes to site preferences and introduce all registries
• 1d66da17 - Fix model fields
• 813fb34d - Drop School and SchoolTerm from admin.py
• d7dbf458 - Drop School stuff
• 5f6aa24f - Add meta class
• 192c6e56 - Add migration
• 0bb2d16f - Fix access to site preferences
• 8a43f0e7 - Fix typo
• 66a5c580 - FIx get_current_site call
• 27d0b60e - Move remaining parts to site preferences
• 9b2e7496 - Determine site by SITE_ID only
• 224bd6fa - Remove stray code
• 9b73e079 - Move import from Site
• 430a0f18 - Get site preferences
• 535d0ea8 - Fix import
• 1bdc98d7 - Fix order of INSTALLED_APPS so we can overwrite templates
• df41b5f3 - Add preferences view
• 9feb92c9 - Add missing CurrentSiteMiddleware
• fdf0d4be - Change dbsettings syntax for footer URLs to dynamic-preferences
• 5c70304b - Add permissions for preferences view
• 18a0043a - Add menu entries for preferences
• ad44b24c - Add buttons for changing preferences to group and person templates
• c399d463 - Merge branch 'feature/dynamic-preferences' of...

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added 2 commits

• 4e484844 - Call super in CoreConfig.ready
• e20548d1 - Use django-dynamic-preferences from Git

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unmarked as a Work In Progress