Widen speed limit types from uint16 to uint32

[got3nks]

Summary

The upload/download speed limits (s_maxupload, s_maxdownload) and slot allocation (s_slotallocation) are stored as uint16, capping the configurable speed to 65534 kB/s (~524 Mbps) since 65535 is treated as unlimited. This is inadequate for modern gigabit+ connections.

• Change s_maxupload, s_maxdownload, s_slotallocation from uint16 to uint32 in Preferences.h / Preferences.cpp, along with their getters and setters
• Change GetMaxSlots() return type and local variables from uint16 to uint32 to prevent truncation when calculating slot counts from large speed values
• Update SetPreferencesConnections() parameter types in RemoteConnect.h

Backward compatibility

• The existing backwards compatibility check in CheckUlDlRatio() that maps 0xFFFF to UNLIMITED still works correctly with uint32
• MkCfg_Int is templated and handles uint32 without changes
• MAX_UP_CLIENTS_ALLOWED remains at 250 (unchanged)

EC protocol note

EC tags EC_TAG_CONN_MAX_UL, EC_TAG_CONN_MAX_DL, and EC_TAG_CONN_SLOT_ALLOCATION now carry uint32 values. The Apply() method uses oneTag->GetInt() which handles any integer size. EC clients sending these tags should encode them as 32-bit integers.

Files changed

File	Changes
src/Preferences.h	Type widening for declarations, getters, setters
src/Preferences.cpp	Static definitions + setter implementations
src/UploadQueue.h	GetMaxSlots() return type
src/UploadQueue.cpp	GetMaxSlots() implementation + local vars
src/libs/ec/cpp/RemoteConnect.h	EC client method parameter types

[frnjjq]

There is a documentation for the EC protocol. Maybe is great to add this change to the doc in order to keep it current.

[got3nks]

Good call, thank you! Added a new Section 4: Notable Tag Types to docs/EC_Protocol.txt that documents the data types of all EC_TAG_PREFS_CONNECTIONS subtags and calls out the uint16 → uint32 widening for EC_TAG_CONN_MAX_DL, EC_TAG_CONN_MAX_UL, and EC_TAG_CONN_SLOT_ALLOCATION.