Configurable title format for DeoVR

[CoolMintChocolate]

This PR adds the ability for users to specify custom format for DeoVR titles. For example, they can add the release date, or the studio for any particular scene. This uses Golang's template format to achieve this, and uses models.Scene as the data source that get inserted into the template. For example:

• {{.Title}}: the default, it just uses the scene title as DeoVR title, .i.e: Scene Title
• {{.Title}} ({{.ReleaseDate.Format "2006"}}): Scene Title (2020)
• {{.Studio}} - {{.Title}}: Studio - Scene Title

This also supports the Funscript export work that was merged recently.

[maxcom99]

Any word on merging this in?