[Future Request]Support allow_branch in Tech/Doctrine preview.

[Mefisto1029]

Description
Allow to set conditions based on allow_branch.

Example issue

1. Open common/technologies/special_forces_doctrine.txt file preview.
2. Look at bottom left doctrine in marine section.
3. There are 2 doctrine techs

Screenshots

Desktop (please complete the following information):

• OS: Windows 7
• VSCode version: 1.70.3
• Extension version: v0.11.1

[BiscuitCookies]

In 1.15 they also added the mark_technology_tree_layout_dirty which reloads the allow_branch and allow during the game.

So this feature would be extra appreciated now.