Add miniz.c as miniz.rs for diff purposes

No translation has been done. This is merely the miniz.c v1.14 source
file renamed. This allows the translated version to be compared line
for line with the original for bug detection purposes.
Some function signatures
Item fixes
Replace arrow operator
Add Cargo manifest, improve Readme
LOTS of changes

Eliminate macros, C-style for loops, do-while loops,
increment/decrement operators, and usage of undefined behavior.

This change must be reviewed for bugs. The translation of
increment/decrement operators that were in if/while conditions is
unsafe and prone to off-by-one errors.