refactor(wayland): move shaders to separate module

src/wayland/shaders/shader_unlit_gamma.hlsl

@@ -0,0 +1,39 @@
+#include "stereokit.hlsli"
+
+//--name = sk/unlit
+//--diffuse     = white
+//--uv_offset   = 0.0, 0.0
+//--uv_scale    = 1.0, 1.0
+Texture2D    diffuse   : register(t0);
+SamplerState diffuse_s : register(s0);
+float2       uv_scale;
+float2       uv_offset;
+
+struct vsIn {
+	float4 pos  : SV_Position;
+	float3 norm : NORMAL0;
+	float2 uv   : TEXCOORD0;
+};
+struct psIn {
+	float4 pos   : SV_POSITION;
+	float2 uv    : TEXCOORD0;
+	uint view_id : SV_RenderTargetArrayIndex;
+};
+
+psIn vs(vsIn input, uint id : SV_InstanceID) {
+	psIn o;
+	o.view_id = id % sk_view_count;
+	id        = id / sk_view_count;
+
+	float3 world = mul(float4(input.pos.xyz, 1), sk_inst[id].world).xyz;
+	o.pos        = mul(float4(world,         1), sk_viewproj[o.view_id]);
+
+	o.uv    = (input.uv) + uv_offset * uv_scale;
+	return o;
+}
+float4 ps(psIn input) : SV_TARGET {
+	float4 col = diffuse.Sample(diffuse_s, input.uv);
+	col.rgb = pow(col.rgb, float3(2.2));
+
+	return col; 
+}