plugin: use another in combat signature

[quisquous]

The previous one is zero when dying in combat and also during some
cutscenes and transitions. This is an attempt to use one similar
to the previous 6.0 version. However, rather than using the writer
which is the "mov [rax+rcx],bl" line which is complicated to
untangled, use a reader instead.

Unfortunately, this reader is on a "cmp byte" line where the pointer
is not at the end of the instruction. This requires modifying
the SigScan line to handle adjusting for this case, as the scanner
otherwise doesn't know anything about instruction boundaries.

Notes for the future:

Combat is a byte, 0x01 when on, 0x00 when out

Start in combat, search for 0x1, hit next scan a bunch
out of combat, search for 0x0, hit next scan a bunch
In combat but untargeted as 0x1
Find green static address, there should be ~2, see what writes to them:

One is (good):
ffxiv_dx11.exe+B61DD0 - 83 FA 68              - cmp edx,68 { 104 }
ffxiv_dx11.exe+B61DD3 - 7D 70                 - jnl
ffxiv_dx11.exe+B61E45
ffxiv_dx11.exe+B61DD5 - 53                    - push rbx
ffxiv_dx11.exe+B61DD6 - 48 83 EC 20           - sub rsp,20 { 32 }
ffxiv_dx11.exe+B61DDA - 48 63 C2              - movsxd  rax,edx
ffxiv_dx11.exe+B61DDD - 41 0FB6 D8            - movzx ebx,r8l
ffxiv_dx11.exe+B61DE1 - 38 1C 08              - cmp [rax+rcx],bl
ffxiv_dx11.exe+B61DE4 - 74 4E                 - je ffxiv_dx11.exe+B61E34
ffxiv_dx11.exe+B61DE6 - 88 1C 08              - mov [rax+rcx],bl

One is (bad):
ffxiv_dx11.exe+737F10 - 48 89 74 24 20        - mov [rsp+20],rsi
ffxiv_dx11.exe+737F15 - 57                    - push rdi
ffxiv_dx11.exe+737F16 - 48 83 EC 20           - sub rsp,20 { 32 }
ffxiv_dx11.exe+737F1A - 0FB6 02               - movzx eax,byte ptr [rdx]
ffxiv_dx11.exe+737F1D - 33 F6                 - xor esi,esi
ffxiv_dx11.exe+737F1F - 89 05 AB048301        - mov
[ffxiv_dx11.exe+1F683D0],eax { (1) }

The "bad" one apparently is zero when you die in combat, but the "good"
one is not.

Searching for what reads from the good one yields a couple of addresses:

(1) "120 hits"
ffxiv_dx11.exe+4C8229 - 83 78 20 00           - cmp dword ptr
[rax+20],00 { 0 }
ffxiv_dx11.exe+4C822D - 75 07                 - jne
ffxiv_dx11.exe+4C8236
ffxiv_dx11.exe+4C822F - 32 C0                 - xor al,al
ffxiv_dx11.exe+4C8231 - 48 83 C4 28           - add rsp,28 { 40 }
ffxiv_dx11.exe+4C8235 - C3                    - ret
ffxiv_dx11.exe+4C8236 - 80 3D FD82AB01 00     - cmp byte ptr
[ffxiv_dx11.exe+1F8053A],00 { (0),0 }
ffxiv_dx11.exe+4C823D - 0F95 C0               - setne al
ffxiv_dx11.exe+4C8240 - 48 83 C4 28           - add rsp,28 { 40 }

(2) "285 hits"
ffxiv_dx11.exe+4CA3EE - 48 8B 3D E38BA401     - mov
rdi,[ffxiv_dx11.exe+1F12FD8] { (1E2DD4FDA50) }
ffxiv_dx11.exe+4CA3F5 - 48 8D 4F 10           - lea rcx,[rdi+10]
ffxiv_dx11.exe+4CA3F9 - BA 22010000           - mov edx,00000122 { 290 }
ffxiv_dx11.exe+4CA3FE - E8 EDF3B9FF           - call
ffxiv_dx11.exe+697F0
ffxiv_dx11.exe+4CA403 - 83 78 20 00           - cmp dword ptr
[rax+20],00 { 0 }
ffxiv_dx11.exe+4CA407 - 74 2D                 - je ffxiv_dx11.exe+4CA436
ffxiv_dx11.exe+4CA409 - 80 3D 2A61AB01 00     - cmp byte ptr
[ffxiv_dx11.exe+1F8053A],00 { (1),0 }

(3) "866 hits"
ffxiv_dx11.exe+B61FCA - 74 04                 - je ffxiv_dx11.exe+B61FD0
ffxiv_dx11.exe+B61FCC - 3B CE                 - cmp ecx,esi
ffxiv_dx11.exe+B61FCE - 74 13                 - je ffxiv_dx11.exe+B61FE3
ffxiv_dx11.exe+B61FD0 - 85 FF                 - test edi,edi
ffxiv_dx11.exe+B61FD2 - 74 04                 - je ffxiv_dx11.exe+B61FD8
ffxiv_dx11.exe+B61FD4 - 3B CF                 - cmp ecx,edi
ffxiv_dx11.exe+B61FD6 - 74 0B                 - je ffxiv_dx11.exe+B61FE3
ffxiv_dx11.exe+B61FD8 - 80 3C 2A  01          - cmp byte ptr
[rdx+rbp],01 { 1 }