vec2 and vec3 interface is not friendly

[1bardesign]

At the moment, the vector modules have a naming pattern which is fairly user unfriendly. This is affecting uptake.

There are two issues, both basically lead to "hungarian style" names which are hard to understand at a glance.

Type Prefix:

Problem:
Currently, the operation type (scalar or vector) is specified with a "hungarian notation" style single letter prefix.
This avoids type dependent dynamic dispatch and keeps code fast but also is pretty unfriendly to a beginner.

Fix:
fully specified names could be provided for each operation, with hungarian style aliases preserved for writing terse code if preferred. vector_add and vadd both available, but the former canonicalised as the initial definition.

Immediate/Modifying Suffix:

Problem:
Currently, if an operation modifies its operand or not is specified with an "immediate" suffix on the method, eg vaddi for "vector add immediate". This looks a lot more like an assembly instruction than a lua method 😄

Fix:
A different naming convention could be adopted. Current candidate is verb for modifying and verbed for copying - eg normalise and normalised for modifying and copying normalisation respectively.

Note that this would break existing code. It definitely needs to be communicated well to existing users!

I do think both are worth doing though to make the incredibly useful vector modules more likely to get use in the wider community.

[1bardesign]

Done vec2 as of 918c943 - feedback welcome, will need to find some time to do vec3.

[1bardesign]

vec3 still needs doing

I've been underwhelmed when using vec2 honestly and find myself using the shorthand quite often. Other users have said they found it nicer though so probably a win?