Move from tag based versioning to branch based versioning

[Southclaws]

Currently, sampctl users use tags to specify versions:

sampctl/samp-stdlib:0.3.7-R2-1-1

Which works for linear changes. However, a lot of the team want to start experimenting with minor improvements such as missing functions and fixes to certain definitions. This would be easier if split onto a separate branch but doing this with 0.3.DL support is difficult.

So I propose moving from tags to branches, so 0.3.7 could be specified with:

sampctl/samp-stdli@0.3.7-R2-1-1

While keeping master branch the "latest stable" (0.3.7) and maybe opening up "experimental" branches from these base branches for new things like adding native IsValidVehicle(vehicleid); etc.

Another reason for this would be to avoid breaking scripts that already include things such as the IsValidVehicle declaration etc.

I'd like to have some feedback from the sampctl community regarding this as changes to this repository will basically ripple to every project.