Apply configured return.nullable to out parameters

Don't generate a method if a parent already has it

Trampolines parameters transformations

Remove records empty line

Generate child properties

Add long and short types

Use error_chain crate to process errors

Update rust version in appveyor.yml

Add group comments in generated sys

Parse fields in classes and generate correct class structs (resubmit)

Fix load latest girs

Nullable signal parameters

Add nullable override for constructors

Throwable to string

Enums primary detects error domain by function "quark"

Don't return from used_ffi_type basic types

Add signal version override

Add single digit version variant

Add a separate analysis pass

Objects (classes and interfaces) and records ('generated' and 'manual'
ones from all namespaces)...

Proper ffi namespace use in glib

Fix imports from glib when generate glib

Doc mode: change "Since x.y" to "Feature vx_y"

Update toml again

It no longer rejects comments after table headers

```toml
[table] # comment
```

Fix Display error for Duration

Update Cargo.lock file

Detect union ctype

Allow union parameters

Inhibit

Fix signal parameters with Options

Trampoline namespaces

Deprecate functions and signals that deprecated by minimal version

Make cast generated enums to i32 non-scalar

Add used types from signal return

Add collecting statistics

Remove repeating git call.