Fix Replay GUI

[helmutbuhler]

This fixes two issues in the Load Replay GUI:

• If a replay whose map is not in the mapcache is present, it will now continue to display correctly. (Before it tried to display the absolute path of the map, which the gui cannot handle)
• There is no longer a limit of 100 replays max.

[DevGeniusCode]

• Fixes Replay Menu looks broken when a replay with missing map file is listed #126

[helmutbuhler]

I just fixed two more issues:

• When opening a replay with mismatched version via double-click no warning appeared, now it does
• When opening a replay with a map that is no longer present, the game crashed, now it shows an error message

While I was at it, I also display those missing map names in red.

I also had to factor some code into a helper function, which sadly makes the diff a bit harder to understand. I suggest code review by commit.

[Generalcamo]

We may need a solution to handle inserting new strings into .csf files through an EXE, as a fallback option.

[Generalcamo]

New strings should be defined strings editable in CSF or STR, not hard-coded.

[Generalcamo]

Ditto

[helmutbuhler]

Well, we will probably add more strings that need to be localized for the next patch, so I think we should handle that in a separate PR.
I suggest this:

• I add a @todo:TEXT to those two lines here
• I create a new issue that mentions that todo
  Is that ok?

[xezon]

If a replay whose map is not in the mapcache is present, it will now continue to display correctly

This part is merged with #732