Handle bitcoin like chain for rejecting replacement

[gemcoder21]

Error:

-:value: insufficient fee, rejecting replacement :value; new feerate :value LTC/kvB <= old feerate :value LTC/kvB

consider checking pending transaction and propose replacement with higher fee?

[gemcoder21]

@0xh3rman we need to find root cause of these issues and find ways to handle them, to suggest users to override current transaction or raise fees and so on.

[0xh3rman]

I think it's related to pending tx, RBF tx needs higher fee