swim: add new transport

Add SWIM and STM8 to documentation and update TODO file.
Introduce transport "swim" and command "swim newtap".
Switch in swim.c from HLA API to the new SWIM API.
Implement in stlink driver the SWIM APIs as wrappers of existing
HLA functions.
Remove any SWIM related reference from HLA files.
Update stm8 config files and stlink-dap interface config file.

Change-Id: I2bb9f58d52900f6eb4df05f979f7ef11fd439c24
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5530
Tested-by: jenkins

src/transport/transport.h

@@ -98,6 +98,7 @@ bool transport_is_jtag(void);
 bool transport_is_swd(void);
 bool transport_is_dapdirect_jtag(void);
 bool transport_is_dapdirect_swd(void);
+bool transport_is_swim(void);
 
 #if BUILD_HLADAPTER
 bool transport_is_hla(void);