Ports for Upcoming Targets

Fixes and Changes

4059: [Silicon Labs] Rename targets https://github.com/ARMmbed/mbed-os/pull/4059
4115: Support for Qt Creator Generic project export and associated Makefile https://github.com/ARMmbed/mbed-os/pull/4115
3915: Feature vscode https://github.com/ARMmbed/mbed-os/pull/3915
4205: tests: race test - add not supported for single threaded env https://github.com/ARMmbed/mbed-os/pull/4205
4187: [NCS36510] Reduce default heap size allocated by IAR to 1/4 of RAM https://github.com/ARMmbed/mbed-os/pull/4187
4145: test - add nanostack to examples.json file https://github.com/ARMmbed/mbed-os/pull/4145
4093: Update.py: New feature - update a branch instead of a fork, plus general improvements. https://github.com/ARMmbed/mbed-os/pull/4093
4225: fixed missing device_name for xDot and removed progen https://github.com/ARMmbed/mbed-os/pull/4225
4243: Config: config header file should contain new line https://github.com/ARMmbed/mbed-os/pull/4243
4251: Fix C++11 build error w/ u-blox EVK-ODIN-W2 https://github.com/ARMmbed/mbed-os/pull/4251
4236: STM32 Fixed warning related to __packed redefinition https://github.com/ARMmbed/mbed-os/pull/4236
4224: Add `mbed new .` output to export https://github.com/ARMmbed/mbed-os/pull/4224
4190: LPC4088: Enable LWIP feature https://github.com/ARMmbed/mbed-os/pull/4190
4136: Error when bootloader is specified but does not exist https://github.com/ARMmbed/mbed-os/pull/4136
3881: Remove debug links to printf/exit in NDEBUG builds https://github.com/ARMmbed/mbed-os/pull/3881
4260: Inherit Xadow M0 target from LPC11U35_501 https://github.com/ARMmbed/mbed-os/pull/4260
4249: Add consistent button names across targets https://github.com/ARMmbed/mbed-os/pull/4249
4254: Removed unused variable in TARGET_NXP/lpc17_emac.c https://github.com/ARMmbed/mbed-os/pull/4254