McvManagerBotModuleCA changes: make it more accurate and focus on expansion

[dnqbob]

Change McvManagerBotModuleCA accurately expand MCV to nearest resources, with CA's own feature.
This bot module has 3 modes to handle different situations:

1. CheckResourceCreator mode (CRC mode): pick location by check the resource creator on map. (Most accurate and perf friendly)
2. CheckResource mode (CR mode): pick location by check the resource tiles on map. (Less accurate and more costly, but can save the day when there is no resource creator for CRC mode)
3. CheckBase mode (CB mode): pick location by check the near point for expanding base only. (If someone makes map that contains no resource, this mode will do)

Here is also the test version (test on different expansion modes with visualize expansion point)
https://github.com/dnqbob/OpenRA/tree/bot-mcv-expansion-test

[dnqbob]

Fixed an edge case of blocked by larger blocker terrain on deploy choosing