CP1600-series processor support.

Ghidra/Processors/CP1600/build.gradle

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+apply from: "$rootProject.projectDir/gradle/distributableGhidraModule.gradle"
+apply from: "$rootProject.projectDir/gradle/processorProject.gradle"
+apply plugin: 'eclipse'
+eclipse.project.name = 'Processors CP1600'

Ghidra/Processors/CP1600/data/languages/CP1600.cspec

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<compiler_spec>
+  <data_organization>
+    <pointer_size value="2" />
+  </data_organization>
+  <global>
+    <range space="ram"/>
+  </global>
+  <stackpointer register="R6" space="ram"/>
+  <default_proto>
+    <prototype name="unknown" extrapop="0" stackshift="0" strategy="register">
+      <input/>
+      <output/>
+      <unaffected>
+        <register name="R6" />
+      </unaffected>
+    </prototype>
+  </default_proto>
+</compiler_spec>

Ghidra/Processors/CP1600/data/languages/CP1600.ldefs

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<language_definitions>
+   <language processor="CP1600"
+            endian="big"
+            size="16"
+            variant="default"
+            version="1.0"
+            slafile="CP1600.sla"
+            processorspec="CP1600.pspec"
+            id="CP1600:BE:16:default">
+    <description>General Instruments CP1600</description>
+    <compiler name="default" spec="CP1600.cspec" id="default"/>
+  </language> 
+</language_definitions>

Ghidra/Processors/CP1600/data/languages/CP1600.opinion

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+<opinions>
+</opinions>

Ghidra/Processors/CP1600/data/languages/CP1600.pspec

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<processor_spec>
+  <programcounter register="R7"/>
+</processor_spec>