Input - Minor Pointer refactor and documentation updates

- `pointerN` are aliases to backed `pointers[N-1]` array.
  This simplifies (and increases the efficiency of) looping through all the pointers when applicable; also eliminates pointer-existance checks
  Removes various hard-coded limits (added MAX_POINTERS); changed `maxPointers` default
- Removed some special-casing from cases where it did not matter
- Removed `=== false/true`, `==` usage for consistency, changed missing value check to `typeof`, etc.
- Updated documentation for specificty; added `@public\@protected`
- `@deprecated` currentPointers due to odd set pattern; `totalCurrentPointers` is more appropriate.

Author: pnstickne