Partially un-fucked the parser (parseExpression could be better at handling infix and prefix operators).
Added support for more types, including strings and chars.
Fixed a bug regarding DirectImage.

Immidiate TODO list:
 * Continue improving parser
 * More agressive error reporting
 * Enable Union/CoLimit instance type
 * Add an automated testing structure (psyduck?)
 * Add read from file featues, insert, better syntax for joins etc
 * Input a real life dataset
 * ... profit?