Add SSDP CLI with discovery command

[codingjoe]

• Refactor package structure into more modules
• Deprecate old import paths
• Add Pygments lexer plugin
• Improve documentation
• Add CLI including a discovery command
• Add IPv6 support

[codecov[bot]]

Codecov Report

Patch coverage: 93.93% and project coverage change: +9.34 :tada:

Comparison is base (c7dee30) 84.70% compared to head (4b48a10) 94.04%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #94 +/- ## ========================================== + Coverage 84.70% 94.04% +9.34% ========================================== Files 1 7 +6 Lines 85 168 +83 ========================================== + Hits 72 158 +86 + Misses 13 10 -3 ``` | [Impacted Files](https://app.codecov.io/gh/codingjoe/ssdp/pull/94?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron) | Coverage Δ | | |---|---|---| | [ssdp/aio.py](https://app.codecov.io/gh/codingjoe/ssdp/pull/94?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron#diff-c3NkcC9haW8ucHk=) | `66.66% <66.66%> (ø)` | | | [ssdp/\_\_main\_\_.py](https://app.codecov.io/gh/codingjoe/ssdp/pull/94?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron#diff-c3NkcC9fX21haW5fXy5weQ==) | `95.65% <95.65%> (ø)` | | | [ssdp/\_\_init\_\_.py](https://app.codecov.io/gh/codingjoe/ssdp/pull/94?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron#diff-c3NkcC9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (+15.29%)` | :arrow_up: | | [ssdp/deprecation.py](https://app.codecov.io/gh/codingjoe/ssdp/pull/94?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron#diff-c3NkcC9kZXByZWNhdGlvbi5weQ==) | `100.00% <100.00%> (ø)` | | | [ssdp/lexers.py](https://app.codecov.io/gh/codingjoe/ssdp/pull/94?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron#diff-c3NkcC9sZXhlcnMucHk=) | `100.00% <100.00%> (ø)` | | | [ssdp/messages.py](https://app.codecov.io/gh/codingjoe/ssdp/pull/94?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron#diff-c3NkcC9tZXNzYWdlcy5weQ==) | `100.00% <100.00%> (ø)` | | | [ssdp/network.py](https://app.codecov.io/gh/codingjoe/ssdp/pull/94?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron#diff-c3NkcC9uZXR3b3JrLnB5) | `100.00% <100.00%> (ø)` | |

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