core: Add clang-tidy (#8664)

This adds a .clang-tidy file for us.

It's not a strict requirement to be compliant, but I tuned it to be alright.

src/protocols/types/DMABuffer.cpp

@@ -27,7 +27,7 @@ CDMABuffer::CDMABuffer(uint32_t id, wl_client* client, Aquamarine::SDMABUFAttrs
     }
 
     texture = makeShared<CTexture>(attrs, eglImage); // texture takes ownership of the eglImage
-    opaque  = FormatUtils::isFormatOpaque(attrs.format);
+    opaque  = NFormatUtils::isFormatOpaque(attrs.format);
     success = texture->m_iTexID;
 
     if (!success)

src/protocols/types/DataDevice.hpp

@@ -5,15 +5,15 @@
 #include <cstdint>
 #include "../../helpers/signal/Signal.hpp"
 
-enum eDataSourceType {
+enum eDataSourceType : uint8_t {
     DATA_SOURCE_TYPE_WAYLAND = 0,
     DATA_SOURCE_TYPE_X11,
 };
 
 class IDataSource {
   public:
-    IDataSource() {}
-    virtual ~IDataSource() {}
+    IDataSource()          = default;
+    virtual ~IDataSource() = default;
 
     virtual std::vector<std::string> mimes()                                    = 0;
     virtual void                     send(const std::string& mime, uint32_t fd) = 0;

src/protocols/types/SurfaceRole.hpp

@@ -1,6 +1,6 @@
 #pragma once
 
-enum eSurfaceRole {
+enum eSurfaceRole : uint8_t {
     SURFACE_ROLE_UNASSIGNED = 0,
     SURFACE_ROLE_XDG_SHELL,
     SURFACE_ROLE_LAYER_SHELL,