v0.04 Interrupts and Basic Keyboard Chitchat

this update contains:

• numerous fixes to small things, including fixing allocation and array bugs
• implementation of interrupts, IDT, and configurable ISRs from C++
• PIC configuration and remapping
• simple (incomplete) keyboard IO, driven by interrupts
• GUI text rendering, text in panel names and a dedicated text panel
• increased the stack size from 0x200 to 0x800 bytes, due to stack overflows causing problems during interrupts
• bitmap image encoding/packing into the kernel binary

i also updated the naming scheme in the code to reflect a more modern-feeling style.

the star of the show is the fact that for the first time, with the help of interrupts, keyboard input is now supported! yaaaay! give it a try with qemu.