Compact names for brevity

[KyleJHarper]

The function names are human readable which can result in cluttered code. Some people might prefer short-hand. For example:
some_var='happy go Lucky'
bla="$(string_Substring -i 1 "${some_var}")"

Shorter version:
some_var='happy go Lucky'
bla="$(s_sub -i 1 "${some_var}")"

This is extremely low on my priority list, but if people want to vote for it I'll try to come up with a standard and implement it.