Rename num_collisions to collision_count.
Rename num_collisions to collision_count.

All other counting variables are called foo_count, not num_foos.
No behavior change.

lizh06/ninja,ignatenkobrain/ninja,ndsol/subninja,Maratyszcza/ninja-pypi,automeka/ninja,sxlin/dist_ninja,ThiagoGarciaAlves/ninja,tfarina/ninja,sxlin/dist_ninja,fuchsia-mirror/third_party-ninja,fuchsia-mirror/third_party-ninja,dorgonman/ninja,ilor/ninja,maruel/ninja,atetubou/ninja,sxlin/dist_ninja,atetubou/ninja,dorgonman/ninja,Ju2ender/ninja,mohamed/ninja,sgraham/ninja,kissthink/ninja,mydongistiny/ninja,synaptek/ninja,lizh06/ninja,mydongistiny/ninja,bradking/ninja,colincross/ninja,juntalis/ninja,autopulated/ninja,ndsol/subninja,moroten/ninja,colincross/ninja,bmeurer/ninja,dendy/ninja,ctiller/ninja,liukd/ninja,hnney/ninja,sxlin/dist_ninja,martine/ninja,bmeurer/ninja,sxlin/dist_ninja,nafest/ninja,synaptek/ninja,liukd/ninja,jimon/ninja,martine/ninja,maruel/ninja,mgaunard/ninja,ilor/ninja,Maratyszcza/ninja-pypi,fuchsia-mirror/third_party-ninja,iwadon/ninja,moroten/ninja,jendrikillner/ninja,dendy/ninja,ctiller/ninja,martine/ninja,nicolasdespres/ninja,ilor/ninja,dorgonman/ninja,ThiagoGarciaAlves/ninja,mydongistiny/ninja,vvvrrooomm/ninja,jendrikillner/ninja,colincross/ninja,synaptek/ninja,vvvrrooomm/ninja,nico/ninja,sgraham/ninja,mohamed/ninja,metti/ninja,AoD314/ninja,ThiagoGarciaAlves/ninja,sgraham/ninja,metti/ninja,nafest/ninja,bradking/ninja,lizh06/ninja,juntalis/ninja,iwadon/ninja,Maratyszcza/ninja-pypi,nico/ninja,ThiagoGarciaAlves/ninja,Qix-/ninja,AoD314/ninja,juntalis/ninja,Maratyszcza/ninja-pypi,jimon/ninja,maruel/ninja,synaptek/ninja,ninja-build/ninja,maruel/ninja,iwadon/ninja,Ju2ender/ninja,autopulated/ninja,dorgonman/ninja,AoD314/ninja,metti/ninja,mgaunard/ninja,nafest/ninja,atetubou/ninja,ignatenkobrain/ninja,ndsol/subninja,AoD314/ninja,iwadon/ninja,mgaunard/ninja,ctiller/ninja,nico/ninja,ignatenkobrain/ninja,juntalis/ninja,Qix-/ninja,liukd/ninja,Ju2ender/ninja,nafest/ninja,moroten/ninja,dendy/ninja,hnney/ninja,tfarina/ninja,nicolasdespres/ninja,Qix-/ninja,martine/ninja,mydongistiny/ninja,nicolasdespres/ninja,moroten/ninja,sgraham/ninja,automeka/ninja,hnney/ninja,kissthink/ninja,vvvrrooomm/ninja,metti/ninja,tfarina/ninja,nicolasdespres/ninja,jendrikillner/ninja,jendrikillner/ninja,ignatenkobrain/ninja,ninja-build/ninja,tfarina/ninja,colincross/ninja,jimon/ninja,hnney/ninja,lizh06/ninja,ilor/ninja,kissthink/ninja,sxlin/dist_ninja,automeka/ninja,liukd/ninja,dendy/ninja,ninja-build/ninja,mohamed/ninja,bradking/ninja,bmeurer/ninja,atetubou/ninja,autopulated/ninja,Ju2ender/ninja,automeka/ninja,sxlin/dist_ninja,bradking/ninja,fuchsia-mirror/third_party-ninja,bmeurer/ninja,Qix-/ninja,kissthink/ninja,jimon/ninja,nico/ninja,mgaunard/ninja,vvvrrooomm/ninja,ninja-build/ninja,mohamed/ninja,ctiller/ninja,ndsol/subninja,autopulated/ninja