* add ppyoloe semi-det base codes

* fix configs

* fix head distill loss

* add more semi_det configs and fix doc, test=document_fix

* add contrast_loss config, test=document_fix

* add semi cocoo txt file and fix doc, test=document_fix

* add ssld vd in fcos doc, test=document_fix

* fix save_model epoch_id and rename folder

* fix use_simple_ema and docs

* fix docs, test=document_fix