reork symbol/type

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
parser: add Kuvariable

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
parser: context: register variables

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
parser: register variables

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
parser: context: add get

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
tests: update parser tests and make them pass

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>