Hotfix: Issue with loading game breaking the UI.

Issue with vanilla UI causing problems, commented out problematic lines.

Remastered the UI to be more streamlined based on feedback:
- No longer separate mod-alert and drop message.
- The first alert will remain a message about supporting modding, the rest will be customizable alerts per mod.
- The alert symbol will be marked red when new alerts are found, to be cleared as they are read-through.
- Subsequent reloads will mark all alerts as old.
- Added more UI to allow for scrolling forward/back along the alerts list.

The system has been remastered into a true API - so that any mod-author can make use of it:
- As before only requires mod-author to include a ChangeLog.txt (Now expected in /common/ for B42+, as before /media/ for B41-)
- Also supports the use of a changelog.md file if a changelog.txt file is not present, see `ChangeLog.md` for that format. (Suggestion: Omar)
- Alerts support programmable buttons by the mod's respective author.
- Well known sites are color-coded and override a provided title with a logo.
- Sites that do not start with: `https://steamhost.cn/steamcommunity_com`, `https://projectzomboid.com`, `https://theindiestone.com`, require Steam's link filter: `https://steamhost.cn/steamcommunity_com/linkfilter/?u=`.
See: `ChangeLog.txt` and `ChangeLog.md` entry: ALERT_CONFIG for an example.

Fixes: Anchored UI to handle screen size changes.

- Fixed issue with un-collapsing sometimes not respecting the dropMessage's status.

- Fixed issue with hiding the system.

- Fixed issues with B41/B42 not able to mutually read change logs.
- Moved changelog's placement into `common`

- Correct other usage of workshopID

- Fixes issue with upload

- B42 Update.

- Fixes edge case with update logs.