Assembler directives documentation/implementation

[simon987]

Wiki page

• [x] Document ORG directive
• [x] Create unit test for documented ORG example
• [x] Document string constants in DW
• [x] Create unit test for documented string example
• [x] ~Implement character literals (#164)~
• [x] ~Document character literals in DW~
• [x] ~Create unit test for documented character example~
• [x] Implement octal literal (or confirm that it works both in the editor & assembler) (#166, #50)
• [x] Create unit test for documented octal example
• [x] Create unit test for documented binary example
• [x] Document .text and .data sections (verify that this information is not found elsewhere in the wiki, if so, link it)

[kevinramharak]

Did you decide to not implement character literals? having strings is good enoungh imo.