Refactored how CMake passes version & settings info

- keys can now be passed per-build passing -DLAIKA_PUBKEY=[pubkey] & -LAIKA_PRIVKEY=[pubkey] to `cmake -B`
- if those definitions aren't passed, the default public & private key will be used (for quick testing)

lib/include/lconfig.h

@@ -0,0 +1,13 @@
+#ifndef LAIKA_CONFIG_H
+#define LAIKA_CONFIG_H
+
+/* version info */
+#define LAIKA_VERSION_MAJOR 0
+#define LAIKA_VERSION_MINOR 0
+
+/* keys */
+#define LAIKA_PUBKEY "997d026d1c65deb6c30468525132be4ea44116d6f194c142347b67ee73d18814"
+#define LAIKA_PRIVKEY "1dbd33962f1e170d1e745c6d3e19175049b5616822fac2fa3535d7477957a841"
+
+
+#endif