Thread API cleanup

This patch cleans up the thread API and comes with the following
noteworthy changes:

- Introduced Cpu_session::Weight type that replaces a formerly used
  plain integer value to prevent the accidental mix-up of
  arguments.
- The enum definition of Cpu_session::DEFAULT_WEIGHT moved to
  Cpu_session::Weight::DEFAULT_WEIGHT
- New Thread constructor that takes a 'Env &' as first argument.
  The original constructors are now marked as deprecated. For the
  common use case where the default 'Weight' and 'Affinity' are
  used, a shortcut is provided. In the long term, those two
  constructors should be the only ones to remain.
- The former 'Thread<>' class template has been renamed to
  'Thread_deprecated'.
- The former 'Thread_base' class is now called 'Thread'.
- The new 'name()' accessor returns the thread's name as 'Name'
  object as centrally defined via 'Cpu_session::Name'. It is meant to
  replace the old-fashioned 'name' method that takes a buffer and size
  as arguments.
- Adaptation of the thread test to the new API

Issue #1954

repos/base-nova/src/test/platform/main.cc

@@ -76,7 +76,7 @@ void test_pat()
 	 */
 	Nova::Mem_crd snd_crd(map_addr >> PAGE_4K, DS_ORDER, all);
 
-	Nova::Utcb *utcb = reinterpret_cast<Nova::Utcb *>(Thread_base::myself()->utcb());
+	Nova::Utcb *utcb = reinterpret_cast<Nova::Utcb *>(Thread::myself()->utcb());
 	enum {
 		HOTSPOT = 0, USER_PD = false, HOST_PGT = false, SOLELY_MAP = false,
 		NO_DMA = false, EVILLY_DONT_WRITE_COMBINE = false
@@ -186,13 +186,13 @@ void test_server_oom()
 	ep.dissolve(&component);
 }
 
-class Greedy : public Thread<4096> {
+class Greedy : public Thread_deprecated<4096> {
 
 	public:
 
 		Greedy()
 		:
-			Thread<0x1000>("greedy")
+			Thread_deprecated<0x1000>("greedy")
 		{ }
 
 		void entry()
@@ -272,7 +272,7 @@ int main(int argc, char **argv)
 		Genode::config()->xml_node().attribute("check_pat").value(&check_pat);
 	} catch (...) { }
 
-	Thread_base * myself = Thread_base::myself();
+	Thread * myself = Thread::myself();
 	if (!myself)
 		return -__LINE__;
 

repos/base-nova/src/test/platform/server.h

@@ -92,4 +92,4 @@ Genode::Native_capability Test::Component::void_cap() {
 }
 
 Genode::addr_t Test::Component::leak_utcb_address() {
-	return reinterpret_cast<Genode::addr_t>(Genode::Thread_base::myself()->utcb()); }
+	return reinterpret_cast<Genode::addr_t>(Genode::Thread::myself()->utcb()); }