feat: add download, upload and total traffic columns to connections list

[Tarkiin]

This PR implements three new columns in the Connections tab to measure network traffic for TCP connections (IPv4 and IPv6):

• ↓ Speed: Current download speed (updated every 3 seconds).
• ↑ Speed: Current upload speed (updated every 3 seconds).
• Total: Accumulated bytes (download + upload) transferred since the connection was detected by simplewall.

Technical details:

1. TCP Traffic Measurement: Uses GetPerTcpConnectionEStats / SetPerTcpConnectionEStats APIs from IP Helper.
2. Robustness: If the connection stats API fails or lacks administrator privileges, it fails gracefully without crashes, leaving values at zero or empty.
3. Format & Sorting: Numbers are automatically formatted (B, KB, MB, GB, TB) and fully sortable.
4. Localization: Added IDS_TOTAL string key to resources, !example.txt template, and Spanish.ini.
5. UDP Support: UDP connections show empty fields due to lack of native per-connection stats in Windows without complex ETW/WFP overhead.
6. Routine Compatibility: Adjusted item insertion in the ListView to INT_MAX for broader compatibility with different versions of the routine library.

[henrypp]

there is errors:

_r_listview_additem (hwnd, IDC_NETWORK, INT_MAX
adds item with INT_MAX which adds item to nowhere, but INT_ERROR adds to latest item

GetTickCount64
routine already have _r_sys_gettickcount64

[Tarkiin]

Thank you for the review! Both issues have been fixed:

1. INT_ERROR restored — Reverted the listview insertion index back to INT_ERROR as it was originally. Sorry for the unnecessary change.
2. _r_sys_gettickcount64 — Replaced GetTickCount64() with _r_sys_gettickcount64() from routine.
   Both fixes are already pushed to this PR branch.