Rework for LTSC branch

[uhppoted]

Ref. https://github.com/uhppoted/uhppoted/discussions/50

Rework all API functions:

• use preallocated memory for strings
• flatten deeply nested structs
• rework error as struct with error code and error string
• move err into argument list
• LTSC build directive

Tasks:

• [x] get-devices
• [x] get-device
• [x] set-address
• [x] get-status
• [x] get-time
• [x] set-time
• [x] get-listener
• [x] set-listener
• [x] get-door-control
• [x] set-door-control
• [x] open-door
• [x] get-cards
• [x] get-card
• [x] get-card-by-index
• [x] put-card
• [x] delete-card
• [x] delete-cards
• [x] get-event-index
• [x] set-event-index
• [x] get-event
• [x] record-special-events
• [x] get-time-profile
• [x] set-time-profile
• [x] clear-time-profiles
• [x] add-task
• [x] refresh-tasklist
• [x] clear-tasklist
• [x] set-pc-control
• [x] set-interlock
• [x] activate-keypads
• [x] set-door-passcodes
• [x] restore-default-parameters
• [x] merge back into main

Notes

• Windows 10 LTSC Program unable to load certain dll's
• AppLocker CSP
• [char* pointer from string in C#](https://stackoverflow.com/questions/1658269/char-pointer-from-string-in-c-sharp)
• https://learn.microsoft.com/en-us/dotnet/api/system.intptr.op_explicit?view=net-8.0
• https://codereview.stackexchange.com/questions/97186/reading-a-pointer-to-a-string
• https://stackoverflow.com/questions/9175861/how-can-i-convert-an-unmanaged-intptr-type-to-a-c-sharp-string#9175905

[twystd]

• Updated main branch with preallocated strings à la LTSC
• Reworked error handling to use a struct
• Reordered function parameters to follow in-out-err convention

Closing as complete, pending release.