application: Add a "search" action
Add PhotosSearchbar
search-type: Make 'name' a read/write property

PhotosBaseModel should be able to read 'name'.
base-manager: Support titles

... add them to PhotosSearchTypeManager and PhotosSourceManager.
Add PhotosBaseModel
Add PhotosBaseView
selection-toolbar: Fix typo
Add PhotosDropdown
Update to latest libgd

We need GdTaggedEntryTag.
view-model: Update for new GD_MAIN_COLUMN_PULSE
build: Add tagged-entry to LIBGD_INIT

We need GdTaggedEntry and GdTaggedEntryTag.
Add PhotosOverviewSearchbar
main-toolbar: Use PhotosOverviewSearchbar
main-toolbar: Add a search button
base-item: Plug a memory leak
Add PhotosTrackerSearchController
Add PhotosOffsetSearchController
query: Add a flag for the search mode
base-manager: Add a get_where virtual method

... and make PhotosCollectionManager and PhotosSearchTypeManager
override it instead of having their own.
search-type-manager: Add a comment