Clean up line commands

[jzbrooks]

• Convert lineTo commands to horizontalLineTo or verticalLineTo if possible to save a parameter value
• Remove redundant commands line in the case that the next command is the same as the current command

[jzbrooks]

Redundant command optimization is handled here: https://github.com/jzbrooks/guacamole/commit/d33307cf57f1c1cfca66b64e729266e8abaa9a0b

[jzbrooks]

Convert lineTo commands optimization is here: https://github.com/jzbrooks/guacamole/commit/131107f950013e77ee631bba75c5a5727162d519