Allow for user specific themes

[adelowo]

Fixes #5281

[codecov-io]

Codecov Report

Merging #5668 into master will decrease coverage by 0.01%.
The diff coverage is 14.58%.

@@            Coverage Diff             @@
##           master    #5668      +/-   ##
==========================================
- Coverage   37.79%   37.77%   -0.02%     
==========================================
  Files         322      323       +1     
  Lines       47544    47592      +48     
==========================================
+ Hits        17968    17977       +9     
- Misses      26987    27026      +39     
  Partials     2589     2589

Impacted Files	Coverage Δ
models/migrations/migrations.go	2.61% <ø> (ø)	⬆️
modules/setting/setting.go	48.8% <ø> (ø)	⬆️
modules/auth/user_form.go	41.81% <0%> (-9.3%)	⬇️
models/migrations/v77.go	0% <0%> (ø)
routers/user/setting/account.go	26.66% <0%> (-4.59%)	⬇️
routers/routes/routes.go	85.05% <100%> (+0.04%)	⬆️
models/user.go	48.14% <62.5%> (+0.11%)	⬆️
models/repo_list.go	64.55% <0%> (+1.26%)	⬆️

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[adelowo]

Removed WIP as it has been completed now

[lunny]

[...itea/routers/init.go:61 GlobalInit()] [E] Failed to initialize ORM engine: migrate: do migrate: mssql: ALTER TABLE only allows columns to be added that can contain nulls, or have a DEFAULT definition specified, or the column being added is an identity or timestamp column, or alternatively if none of the previous conditions are satisfied the table must be empty to allow addition of this column. Column 'theme' cannot be added to non-empty table 'user' because it does not satisfy these conditions.