major project reorg, move library one level up

watch-library/hal/documentation/ext_irq.rst

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+==============
+EXT IRQ driver
+==============
+
+The External Interrupt driver allows external pins to be
+configured as interrupt lines. Each interrupt line can be
+individually masked and can generate an interrupt on rising,
+falling or both edges, or on high or low levels. Some of
+external pin can also be configured to wake up the device
+from sleep modes where all clocks have been disabled.
+External pins can also generate an event.
+
+Features
+--------
+* Initialization and de-initialization
+* Enabling and disabling
+* Detect external pins interrupt
+
+Applications
+------------
+* Generate an interrupt on rising, falling or both edges,
+  or on high or low levels.
+
+Dependencies
+------------
+* GPIO hardware
+
+Concurrency
+-----------
+N/A
+
+Limitations
+-----------
+N/A
+
+Knows issues and workarounds
+----------------------------
+N/A
+