build: add cmake support

feat: add cmake support

chore: remove old code

revert: remove mbus_data_record_unit

build: do not break existing building system

build.sh

@@ -1,21 +1,7 @@
 #!/bin/sh
-#
 
-if [ -f Makefile ]; then
-    # use existing automake files
-    echo >> /dev/null
-else
-    # regenerate automake files
-    echo "Running autotools..."
-
-    autoheader \
-        && aclocal \
-        && case \
-          $(uname) in Darwin*) glibtoolize --ltdl --copy --force ;; \
-          *) libtoolize --ltdl --copy --force ;; esac \
-        && automake --add-missing --copy \
-        && autoconf \
-        && ./configure
-fi
-
-make
+rm -rf _build
+mkdir _build
+cd _build
+cmake .. -DLIBMBUS_BUILD_EXAMPLES=ON -DLIBMBUS_BUILD_TESTS=ON
+cmake --build .