* try to trigger illegal instruction with div

* add soft exceptions to build

* beginnings of soft exception handler. r-type decoding added!

* change one comment

* rename soft_exceptions to soft_instructions

* add newline to end of files

* restore hello_world.c to original state, create illegal_instruction_experiments.c

* added file descriptions

* added support for rem, remu, and div

* added prototypes for misaligned access handlers

* added comment about bitfield struct, fixed some compile errors

* added mul support

* fixed sign extension for mulh and mulhsu, added inline asm to test

* support for division overflow, and improvements to test cases

* add eric to LICENCE!

* add maybe_unused to avoid release mode build errors