* update eigen version to f612df27, test=develop

* fix compilation error, test=develop

* remove patch command in eigen, test=develop

* fix compilation error caused by call Eigen function with float16 and bfloat16, test=develop

* fix unittest error, test=develop

* fix unittest error caused by precision, test=develop

* remove patch files used by old version eigen, test=develop

* remove eigen deps dof float16

* add cstdlib header

* replace stdlib header by cmath

* init commit

* move eigen of bfloat16

* add complex header