Set flags on loaded

[danhunsaker]

This allows loading scripts in order, using FLAG IS TRUE instead of TIME AFTER, which will allow each script to load immediately after the previous one is ready. I updated the README as well, but in general:

- Trigger: Script Initialization
  Action: Do Script File
  File: mist.lua

- Trigger: FLAG IS TRUE
  Flag: MiST_Loaded
  Action: Do Script File
  File: ctld-i18n.lua

- Trigger: FLAG IS TRUE
  Flag: CTLD-i18n_Loaded
  Action: Do Script File
  File: ctld.lua

And then if ctld.dontInitialize == true:

- Trigger: FLAG IS TRUE
  Flag: CTLD_Loaded
  Action: Do Script
  Script: ctld.initialize()

Though I did notice that ctld.dontInitialize isn't documented in the README, so that might need to be added as well, at some point.

I wasn't able to update the sample mission(s) because I don't have DCS working at the moment - I'm doing code for someone else's missions, and my laptop's drives are full, so it might be a while until I can access the mission editor.