* WIP. issues with setting PC correctly via POP are corrected. issues with pc relative addressing in thumb mode corrected. Still a memory access error, but getting there
* WIP - PC relative addressing in thumb mode now aligns the value for PC per the spec before applying offset
* General thumb mode fixes:
* ldr pc, <operand> now swaps modes and sets pc correctly
* the bl instruction sets the lr appropriately for the current mode
* the two operand forms of the ORR, EOR, and BIC instructions now exist
* tests added for these updates
* comment cleanup
* WIP :more thumb mode instructions, a special case for the sys_brk handled, and a really ugly solution to an internal plumbing problem
* First attempt at concretizing ARM mode
* Handle symbolic mode for ARMv7
* Clean up imports
* Make comment more accurate and use instruction.size
* Collapse _Shift and _Shift_thumb
* Make ARM mode handling more Pythonic
* Improve comment on arm shift register handling and capstone behavior
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