PatchInstaller refactor + index/integrity autogen

[Soreepeong]

Changes

1. Split out handlers for each commands into different files.
2. Added index-update: download the patch list, download the patch files if necessary, and create new patch index files from the latest resumable patch index file.

XIVLauncher.PatchInstaller.exe index-update ^
    C:\PATH_TO_PATCH_ROOT  ^
    -u <SE_username> ^
    -p <SE_password> ^
    -o <SE_OTP_if_any> ^
    --no-verify-old-patch-hash ^
    --no-verify-new-patch-hash

3. Added index-create-integrity: create and print IntegrityCheckResult in JSON format.

XIVLauncher.PatchInstaller.exe index-create-integrity ^
    C:\PATH_TO_PATCH_ROOT ^
    C:\PATH_TO_PATCH_ROOT\game\4e9a232b\D2023.10.23.0000.0000.patch.index ^
    C:\PATH_TO_PATCH_ROOT\game\ex1\6b936f08\D2023.10.23.0000.0000.patch.index ^
    C:\PATH_TO_PATCH_ROOT\game\ex2\f29a3eb2\D2023.10.23.0000.0000.patch.index ^
    C:\PATH_TO_PATCH_ROOT\game\ex3\859d0e24\D2023.10.23.0000.0000.patch.index ^
    C:\PATH_TO_PATCH_ROOT\game\ex4\1bf99b87\D2023.10.23.0000.0000.patch.index

Confirmed stuff

• index-create-integrity results the exact same file for 2023.10.23.0000.0000.
• index-update worked across 6.50 and 6.51.
• index-create, index-verify, and index-repair still work. (Mostly for debug purposes)
• install still works.

Non-confirmed stuff

• RPC patch/repair.

Not implemented

• Patch download using signed URLS.