Log Message:
swirc: update to 3.4.6.

## [3.4.6] - 2023-11-05 ##
- **Added** adoption of SPDX-tags for the distributed manual pages
- **Added** better detection of server Wallops
- **Added** command-line option `-S` (Force TLS)
- **Added** event 249 (`RPL_STATSDEBUG`)
- **Added** extensive use of the `CPPFLAGS` make macro
- **Added** handling of empty user@host combinations in Wallops messages
- **Added** handling of znc messages. (Made them look like notices and
  appear in the active window.)
- **Added** protection for bad filenames for IRC logs
- **Added** translations
- **Changed** the way of recognizing a user mode versus channel mode
- **Did** code improvements
- **Fixed** occurrences of hardcoded function names in messages
- **Fixed** typos in manual pages
- **Improved** C++ exception handling
- **Limited** notification messages in length

## [3.4.5] - 2023-09-14 ##
- **Added** command-line option `-W`
- **Added** tab completion for:
  - `/cs`, `/chanserv`
  - `/ns`, `/nickserv`
  - `/squery`
- **Added** the following commands:
  - `/admin`
  - `/die`
  - `/gline`
  - `/info`
  - `/ison`
  - `/kline`
  - `/rehash`
  - `/restart`
  - `/servstats`
  - `/wallops`
- **Added** the following events:
  - 211 (`RPL_STATSLINKINFO`)
  - 212 (`RPL_STATSCOMMANDS`)
  - 216 (`RPL_STATSKLINE`)
  - 219 (`RPL_ENDOFSTATS`)
  - 242 (`RPL_STATSUPTIME`)
  - 256 (`RPL_ADMINME`)
  - 257 (`RPL_ADMINLOC1`)
  - 258 (`RPL_ADMINLOC2`)
  - 259 (`RPL_ADMINEMAIL`)
  - 303 (`RPL_ISON`)
  - 371 (`RPL_INFO`)
  - 374 (`RPL_ENDOFINFO`)
- **Added** translations
- **Did** code improvements