Implement #1992

[nikeinikei]

The settings table for Texture and GraphicsBuffer can now include a new field debugname,
If given, it will appear in a graphics debugger such as RenderDoc, if supported.
it can also be queried via texture:getDebugName() or buffer:getDebugName(), which either returns a string if a debug name was given during initialization, or nil otherwise.

Example:

local texture = love.graphics.newCanvas(64, 64, { debugname = "shadowpass" })
print(texture:getDebugName())    --prints "shadowpass"

local format = {
    { name = 'position', format = 'floatvec2' },
    { name = 'velocity', format = 'floatvec2' },
    { name = 'color', format = 'floatvec4' }
}
local count = 1000000

local buffer = love.graphics.newBuffer(format, count, { shaderstorage = true, debugname = "particles" })
print(buffer:getDebugName())    --prints "particles"