Decrease SearchFromProcRadius and SearchFromOrderRadius

[abcdefg30]

As discussed on IRC and Discord. Values suggested and approved by @netnazgul.
Only thing I changed was the radii for the weed harvester, it needs to cover longer distances (so it is double the new value now).

[pchote]

We need to be careful here - as I noted in IRC and Discord it turns out that SearchFromProcRadius is, most of the time, not being used to search from the refinery. It is instead being used from the harvesters location in the field, which means that any values derived from testing will be mostly sampling the wrong thing.

Can we instead introduce a new SearchFromHarvesterRadius (maybe combining/renaming with SearchFromOrderRadius?) and set that to 15?

[tovl]

ScanFromProcRadius should only be used to scan from the refinery. If it is not, then that is a bug.

ScanFromOrderRadius is indeed a misnomer now, because it scans from the last harvested position most of the time, unless explicitly ordered (and then only the first time).

[abcdefg30]

Updated with the suggested changes and renamed SearchFromOrderRadius to SearchFromHarvesterRadius.

[pchote]

File is missing the standard license header

[abcdefg30]

Updated.

[teinarss]

https://github.com/OpenRA/OpenRA/wiki/Changelog-(bleed)/_compare/c7954b24ac145ec20a21f61bf775cffd591fe85a...ef91d3a00df221ff84b6c28d0c7849c212e0427f