Mod Page Improvements

[elexis]

The mod selection page currently doesn't validate mods and the page can benefit from a number of improvements:

Implementable features:

• Drop _ and - from mod versions ​Phab:D1094
  
• Drop mod types ​Phab:D1082
  
• Add documentation, validation, validation test: ​Phab:D1093
  
• Translate mod title and description: ​Phab:D1083
  
• Visit URL button ​Phab:D1101
  
• Arrow icons and Disable button ​Phab:D1079
  
• Disable save button if there are no changes
  
• Mod version label property ​Phab:D1080
  
• Rename modmod to modselection ​Phab:D1095
• Sort mods by dependency (topologic sort)
  
• Save mod version in replays and savegames #4887

Previous improvements:

In r15677:
Add mod selection mod

In r16736:
hotkey.cancel mapped to the Escape key

In r20195:
white text

In r20550:
Doubleclick lists, refs #3574 / rP17274.
Filter while typing, refs D860 / rP20091.

In r20555:
Replace mod selection sorting choice dropdown and checkbox with the column based sorting from rP16781, refs #2405.

[elexis]

In 20575:

Deprecate type property of mods.
Such a property should be well defined, but currently it contains arbitrary text and is redundant with the description.

Differential Revision: ​https://code.wildfiregames.com/D1082
Refs #4890
Discussed with: leper
Reviewed By: wraitii

[elexis]

In 20599:

Add buttons to visit the website of the selected mod.

Differential Revision: ​https://code.wildfiregames.com/D1101
Refs #4890
Reviewed By: Grugnas
Comments By: fpre / ffffffff

[elexis]

In 20645:

Hide the cancel button in the modmod of the mod mod and the quit button when called from the public mod.

Differential Revision: ​https://code.wildfiregames.com/D1141
Reviewed By: Grugnas
Refs #4890

[Imarok]

Move tickets to their correct component as "UI & Simulation" got some sub components.