Convert from setup.py to pyproject.toml

Dockerfile

@@ -7,11 +7,6 @@ ENV LANG=C.UTF-8 \
 RUN apt-get update; \
     apt-get install -y git python3-pip gnupg make g++ autoconf automake libtool pkg-config gosu tzdata;
 
-ARG COINCURVE_VERSION=v0.2
-RUN git clone https://github.com/basicswap/coincurve.git -b basicswap_$COINCURVE_VERSION coincurve-basicswap && \
-    cd coincurve-basicswap && \
-    pip install .
-
 # Install requirements first so as to skip in subsequent rebuilds
 COPY ./requirements.txt requirements.txt
 RUN pip3 install -r requirements.txt