Add CMake support

Clean up file structure.
Update build scripts.

scripts/build.alpine.release.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+mkdir obj
+set -xe
+
+apk add gcc g++ build-base linux-headers cmake make autoconf automake libtool
+apk add libressl-dev zlib-dev rapidjson-dev libevent-dev libevent-static zlib-static pcre-dev
+
+git clone https://github.com/curl/curl
+cd curl
+./buildconf
+./configure --with-ssl --disable-ldap --disable-ldaps --disable-rtsp --without-libidn2 > /dev/null
+make install -j4 > /dev/null
+cd ..
+
+git clone https://github.com/jbeder/yaml-cpp
+cd yaml-cpp
+cmake . > /dev/null
+make install -j4 > /dev/null
+cd ..
+
+git clone git://sourceware.org/git/bzip2.git
+cd bzip2
+make install -j4 > /dev/null
+cd ..
+
+cmake .
+make -j4
+g++ -o base/subconverter CMakeFiles/subconverter.dir/src/*.o  -static -lpcrecpp -lpcre -levent -lyaml-cpp -lcurl -lssl -lcrypto -lz -lbz2 -ldl -lpthread -O3 -s  
+
+cd base
+chmod +rx subconverter
+chmod +r *
+
+tar czf subconverter_linux64.tar.gz *