implement registers for `.t` and `.p` instructions #410

Job	Run time
Build repo	14s
Test - build_info_checks	4s
Test - instruction_checks_plain_disassembly	4s
Test - instruction_checks_all	8s
Test - instruction_checks_jalr	4s
Test - instruction_checks_r3000gte_disasm	5s
Test - instruction_checks_r4000allegrex_disasm	8s
Test - instruction_checks_r4000allegrex_vfpu_disasm	4s
Test - instruction_checks_r5900_trunc_cvt	4s
Test - instruction_checks_r5900_vcallms	4s
Test - logic_checks	3s
	1m 2s

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