Revamp deploy.py

Now the script supports more flashing methods:
- JLink (with tockloader)
- OpenOCD (with tockloader)
- pyOCD
- Nordic DFU
- none (will produce an IntelHex file)

Also merged the contributions from:
- Yihui Xiong to support the Makerdiary USB dongle board
- Dennis Geurts to support Nordic DFU

Doc updated accordingly.

Imported 2 patches for Tock kernel:
- 06-add-set_vector_table_offset.patch (upstream tock/tock#1579)
- 07-nrf52-bootloader.patch (upstream tock/tock#1681)

patches/tock/07-nrf52-bootloader.patch

@@ -0,0 +1,21 @@
+diff --git a/chips/nrf52/src/crt1.rs b/chips/nrf52/src/crt1.rs
+index 9703aac..281ceeb 100644
+--- a/chips/nrf52/src/crt1.rs
++++ b/chips/nrf52/src/crt1.rs
+@@ -1,4 +1,4 @@
+-use cortexm4::{generic_isr, hard_fault_handler, nvic, svc_handler, systick_handler};
++use cortexm4::{generic_isr, hard_fault_handler, nvic, scb, svc_handler, systick_handler};
+ use tock_rt0;
+ 
+ /*
+@@ -168,5 +168,9 @@ pub unsafe extern "C" fn init() {
+     tock_rt0::init_data(&mut _etext, &mut _srelocate, &mut _erelocate);
+     tock_rt0::zero_bss(&mut _szero, &mut _ezero);
+ 
++    // Ensure that we are compatible with a bootloader.
++    // For this we need to offset our vector table
++    scb::set_vector_table_offset(BASE_VECTORS.as_ptr() as *const ());
++
+     nvic::enable_all();
+ }
+