Muon detector showers lines. Requires Rec!3756

Needs Rec!3756 (merged) and lhcb-datapkg/ParamFiles!67 (merged)

Work developed mostly by @cbeaubis and @hartmanl. FYI: @lshchuts @cbeaubis @vguliaev

Runs a MVA selection on the number of hits in the muon system, using functors defined in Rec!3756 (merged).

The aim is to select shower in the muon detector, to enhance sensitivity to long-lived particle decays (in particular, ALPs and HNLs). Some related work has been presented in the QEE weekly meeting and the RTA WP3 meeting.

### Local Estimation of BW
__With Changes:__  
Ran over 10,000 events.  
- Turbo filesize = 3.2 MB. Turbo Events fired = 689  
- Turbo Rate = 1.14 MHz * 689 / 10,000 = `78.5 kHz`  
- Turbo BW = 1.14 MHz * 3.2 MB / 10,000 = `365 MB/s`  

- Full-stream filesize = 7,100 kB. Turbo Events fired = 56 
- Full-stream Rate = 1.14 MHz * 56 / 10,000 = `6.4 kHz`  
- Full-stream BW = 1.14 MHz * 7.1 MB / 10,000 = `809 MB/s`  

__Without Changes:__  
- Turbo filesize = 3.3 MB. Turbo Events fired = 689  
- Turbo Rate = 1.14 MHz * 689 / 10,000 = `78.5 kHz`  
- Turbo BW = 1.14 MHz * 3.3 MB / 10,000 = `376 MB/s`  



- Full-stream filesize = 7.1 MB. Turbo Events fired = 56 
- Full-stream Rate = 1.14 MHz * 56 / 10,000 = `6.4 kHz`  
- Full-stream BW = 1.14 MHz * 7.1 MB / 10,000 = `809 MB/s`  

__Conclusion:__  
Ran locally over 10,000 events.  
Change to QEE's Turbo Rate = 0%
Change to QEE's Turbo BW = +3%
Change to QEE's Full-stream Rate = 0%
Change to QEE's Full-stream BW = 0%

Signal efficiency: 17%

Persistency: Turbo + Muon Hits + Muon Long tracks.

Hlt/Hlt2Conf/python/Hlt2Conf/lines/qee/hlt2_qee.py

@@ -27,6 +27,7 @@ from Hlt2Conf.lines.qee import dielectron_persist_photons
 from Hlt2Conf.lines.qee import dimuon_no_ip
 from Hlt2Conf.lines.qee import calibration
 from Hlt2Conf.lines.qee import ttrack_llps
+from Hlt2Conf.lines.qee import muon_detector_showers
 
 full_lines = {}
 full_lines.update(single_high_pt_muon.all_lines)
@@ -48,3 +49,4 @@ turbo_lines.update(dielectron_persist_photons.turbo_lines)
 turbo_lines.update(calibration.turbo_lines)
 turbo_lines.update(wz_boson_rare_decays.all_lines)
 turbo_lines.update(ttrack_llps.all_lines)
+turbo_lines.update(muon_detector_showers.all_lines)