Better error reporting

[v0dro]

Various methods for catching errors exist in compilers. Document best approaches for doing so in this issue and tackle the following problems in error reporting:

• Print location of statement before outputting any statement.
• Print location of line number where a compile error happened to STDOUT.
• Research and setup various error classes that can arise out of a badly written program and how they should be reported.

Errors to handle:

• Proper declaration of required functions in attached classes.
• Error if attached classes are being used and rubex/ruby is not required using lib.

[v0dro]

Preliminary resources:

• https://www.obj-sys.com/docs/acv62/CCppHTML/ch02s06.html
• https://softwareengineering.stackexchange.com/questions/39700/how-should-compilers-report-errors-and-warnings
• https://en.wikibooks.org/wiki/Compiler_Construction/Dealing_with_errors