Expand searching possibilities

[Neraste]

Allow to search more items in the server:

• Query playlist entries;
  • Queuing;
  • Played;
• Player errors;
• Query users;
• Query song tags.

Add fields:

• Id:
  • Songs;
  • Playlist entries;
  • Player errors;
  • Users.

Side effects:

• Make query language use agnostic:
  • Just detect the keyword:value pattern (with or without ddouble quotes);
  • Remove tags as #?
• Move query functions to a dedicated file;

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.69%. Comparing base (51c64f5) to head (4a261bd).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #181      +/-   ##
===========================================
+ Coverage    98.61%   98.69%   +0.07%     
===========================================
  Files           78       83       +5     
  Lines         1876     1985     +109     
===========================================
+ Hits          1850     1959     +109     
  Misses          26       26              

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