Indent every scope and put opening braces on the signature line

Namespace and extern "C" bodies are indented a level, so nesting is
visible from the indentation rather than only from the braces. Opening
braces stay on the line that opens the scope, including function
definitions, which previously carried theirs on a line of their own.

include/internal/version.hpp

@@ -23,14 +23,12 @@
 #pragma once
 
 namespace dpm_core {
-
-/**
- * @brief Parses a strict X.Y.Z version string
- *
- * @param s The version string
- * @param out Receives the three parsed components
- * @return true on success; false on any malformation
- */
-bool parse_version(const char* s, long out[3]);
-
+    /**
+     * @brief Parses a strict X.Y.Z version string
+     *
+     * @param s The version string
+     * @param out Receives the three parsed components
+     * @return true on success; false on any malformation
+     */
+    bool parse_version(const char* s, long out[3]);
 } // namespace dpm_core