Remove toolchain version from go.mod

update golang.org/x/tools version to 0.25.1

imports/log_syslog.go does not compile on Windows - disable it on unsupported OSes

add some new imports/*.go files containing new standard packages from Go toolchain 1.18.10

update imports/*.go with standard packages from Go toolchain 1.18.10

improve fix for issue #142: early check for types that cannot have methods was still bugged

add TODO remainder to all_test.go about adding test for fixed issue #142

fix issue #142: method lookup always fails for pointers to named array types, named slice types, and all other named non-struct types

fix xreflect.Method.String() when printing empty or incomplete Method objects i.e. containing a nil GoFun

update README.md with better description of generics support.

update README.md, clarify that when importing packages, generics are not imported

remove unneeded files base/genimport/check_go_version.go go/types/check_go_version.go

update go.mod

update required go version = 1.18 in go.mod

when importing packages, skip generic types and functions because they are not supported yet