Add Linux support

- Add linux build system using MakeGen
- Fix a swapchain validation error, likelydue to my linux system using a
  different vulkan version
- Make DescriptorPool take in amount of descriptors it needs, instead of
  allocating a mass amount for every pool, causing loads of RAM/VRAM usage

CopiumEngine/makegen.xml

@@ -0,0 +1,53 @@
+<makegen>
+  <configuration name="Release">
+    <define>MSDF_ATLAS_PUBLIC=</define>
+    <define>GLM_FORCE_LEFT_HANDED</define>
+    <define>GLM_FORCE_RADIANS</define>
+    <define>GLM_FORCE_DEPTH_ZERO_TO_ONE</define>
+    <dependency>../ext/projects/imgui/</dependency>
+    <dependency>../ext/projects/msdf-atlas-gen/</dependency>
+    <dependency>../ext/projects/msdfgen-core/</dependency>
+    <dependency>../ext/projects/msdfgen-ext/</dependency>
+    <generatehfile>false</generatehfile>
+    <outputdir>bin/Release/</outputdir>
+    <outputname>libcopium.so</outputname>
+    <outputtype>sharedlibrary</outputtype>
+    <projectname>Copium Engine</projectname>
+    <srcdir>src/</srcdir>
+    <includedir>src/</includedir>
+    <includedir>../ext/repos/imgui/</includedir>
+    <includedir>../ext/repos/imgui/backends/</includedir>
+    <includedir>../ext/repos/freetype/</includedir>
+    <includedir>../ext/repos/msdf-atlas-gen/msdfgen/</includedir>
+    <includedir>../ext/repos/msdf-atlas-gen/</includedir>
+    <includedir>../ext/repos/stb/</includedir>
+  </configuration>
+  <configuration name="Debug">
+    <cflag>-g3</cflag>
+    <cflag>-w</cflag>
+    <define>_DEBUG</define>
+    <define>MSDF_ATLAS_PUBLIC=</define>
+    <define>GLM_FORCE_LEFT_HANDED</define>
+    <define>GLM_FORCE_RADIANS</define>
+    <define>GLM_FORCE_DEPTH_ZERO_TO_ONE</define>
+    <dependency>../ext/projects/imgui/</dependency>
+    <dependency>../ext/projects/msdf-atlas-gen/</dependency>
+    <dependency>../ext/projects/msdfgen-core/</dependency>
+    <dependency>../ext/projects/msdfgen-ext/</dependency>
+    <generatehfile>false</generatehfile>
+    <outputdir>bin/Debug/</outputdir>
+    <outputname>libcopium.so</outputname>
+    <outputtype>sharedlibrary</outputtype>
+    <projectname>Copium Engine</projectname>
+    <srcdir>src/</srcdir>
+    <includedir>src/</includedir>
+    <includedir>../ext/repos/imgui/</includedir>
+    <includedir>../ext/repos/imgui/backends/</includedir>
+    <includedir>../ext/repos/freetype/</includedir>
+    <includedir>../ext/repos/msdf-atlas-gen/msdfgen/</includedir>
+    <includedir>../ext/repos/msdf-atlas-gen/</includedir>
+    <includedir>../ext/repos/stb/</includedir>
+  </configuration>
+  <target>Debug</target>
+  <version>v1.3.4</version>
+</makegen>