Changing kebab case filenames in source to snake case for consistency

src/CMakeLists.txt

@@ -6,8 +6,8 @@ option(USE_STATIC_CRT "Use /MT[d] for dynamic library" OFF)
 set(CMAKE_CXX_STANDARD 14)
 
 set(BASE_RPC_SRC
-    ${PROJECT_SOURCE_DIR}/include/discord-rpc.h
-    discord-rpc.cpp
+    ${PROJECT_SOURCE_DIR}/include/discord_rpc.h
+    discord_rpc.cpp
     ${PROJECT_SOURCE_DIR}/include/discord_register.h
     rpc_connection.h
     rpc_connection.cpp
@@ -129,7 +129,7 @@ install(
 
 install(
     FILES
-        "../include/discord-rpc.h"
+        "../include/discord_rpc.h"
 		"../include/discord_register.h"
     DESTINATION "include"
 )

src/discord_register_linux.cpp

@@ -1,4 +1,4 @@
-#include "discord-rpc.h"
+#include "discord_rpc.h"
 #include "discord_register.h"
 #include <stdio.h>
 

src/discord_register_win.cpp

@@ -1,4 +1,4 @@
-#include "discord-rpc.h"
+#include "discord_rpc.h"
 #include "discord_register.h"
 
 #define WIN32_LEAN_AND_MEAN

src/discord_rpc.cpp

@@ -1,4 +1,4 @@
-#include "discord-rpc.h"
+#include "discord_rpc.h"
 
 #include "backoff.h"
 #include "discord_register.h"

src/serialization.cpp

@@ -1,6 +1,6 @@
 #include "serialization.h"
 #include "connection.h"
-#include "discord-rpc.h"
+#include "discord_rpc.h"
 
 template <typename T>
 void NumberToString(char* dest, T number)