Remove hardcoded paths in UE4 plugin scripts to path "<project>/Plugins/*BugSplat*"

[fuzzybotcg]

Hello,

I noticed that the BlugSplat UE4 plugin is writing batch files into "/Plugins/BugSplat" directory. It assumes that the plugin can only be installed on this directory. Also the "Bugsplat/Scripts" folder has batch files that make this assumption, as well.

The plugin should be able to install in any directory under "Plugins". As is, it's creating artifacts in the hard coded directory mentioned.

Example: Consider that the github repo's root folder, "bugsplat-unreal", does not match the directory name the documentation say to use, "BugSplat". With UE4, It's common practice to just copy the repo of a plugin directly into "Plugins" (or even a subfolder in "Plugins")