renderdoc 0.8.0

Added

• Add dedicated Error type to be used throughout the library.

Changed

• Expand API documentation and improve existing documentation quality (PR #81).
• Accept and return PathBuf or &Path in places instead of String and &str (PR #82).
• Accept Into<String> and Into<PathBuf> instead of AsRef in places where we are going to be allocating anyway (PR #82).
• Return std::time::SystemTime instead of a raw u64 in get_capture().
• Convert crate to Rust 2018 edition.
• Bump float-cmp dependency to 0.7.
• Bump libloading dependency to 0.6.
• Switch to Circle CI Rust 1.40.0 image.

Deprecated

• Mark get_log_file_path_template() and set_log_file_path_template() as deprecated for all RenderDoc API versions after 1.1.2 (PR #83).