Update to fix graphic issues with Haegemonia and enhance compatibility

[elishacloud]

• Removed "device->SetFVF(D3DFVF_XYZ);" line from Direct3D8::CreateDevice. This fixes an issue with game Haegemonia Legions of Iron. It seems there is no need to declare a default vertex here. According to Microsoft documentation D3D8 applications should call SetVertexShader API before using a vertex and SetFVF already called when an application calls SetVertexShader. https://msdn.microsoft.com/en-us/library/windows/desktop/bb204851(v=vs.85).aspx#Vertex_Declaration_Changes
• Minor updates to convert_caps and convert_surface_desc to simplify code.
• Updates to convert_present_parameters for better d3d9 copmatibility.
• Updated logic for when MultiSampleType should be set to D3DMULTISAMPLE_NONE.
• Changed PresentationInterval to default to D3DPRESENT_INTERVAL_ONE, the normal d3d9 default and makes more copmatible with d3d9 when D3DSWAPEFFECT_COPY_VSYNC was used. According to Microsoft D3DPRESENT_INTERVAL_IMMEDIATE did nothing in fullscreen on d3d8 when D3DSWAPEFFECT_COPY_VSYNC was used. So this is attempting to replicate that behavor.
• Minor updates to the code slightly for when SwapEffect is set to D3DSWAPEFFECT_COPY.
• Added some documentation to the code

[elishacloud]

Updated to remove else statements and move variable assignment above.

[elishacloud]

Fix varable name in convert_present_parameters

[crosire]

Perfect!