ZSA transaction support (#9)

ZSA transaction support

.cargo/config.toml

@@ -0,0 +1,5 @@
+[target.'cfg(all())']
+rustflags = [
+    # FIXME: Consider removing this line later (it's needed for the ZSA version of librustzcash crates)
+    "--cfg", "zcash_unstable=\"nu6\"",
+]

.github/workflows/lints.yml

@@ -17,6 +17,8 @@ jobs:
     name: Clippy (MSRV)
     timeout-minutes: 30
     runs-on: ubuntu-latest
+    env:
+      RUSTFLAGS: '--cfg zcash_unstable="nu6"'
     steps:
       - uses: actions/checkout@v4
       - name: Run Clippy

.run/Test.run.xml → .run/Test Orchard.run.xml

@@ -1,15 +1,16 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Test" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
-    <option name="command" value="run --package zcash_tx_tool --bin zcash_tx_tool test" />
+  <configuration default="false" name="Test Orchard" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="buildProfileId" value="dev" />
+    <option name="command" value="run --package zcash_tx_tool --bin zcash_tx_tool test-orchard" />
     <option name="workingDirectory" value="file://$PROJECT_DIR$" />
+    <envs />
     <option name="emulateTerminal" value="true" />
     <option name="channel" value="DEFAULT" />
     <option name="requiredFeatures" value="true" />
     <option name="allFeatures" value="false" />
     <option name="withSudo" value="false" />
     <option name="buildTarget" value="REMOTE" />
     <option name="backtrace" value="SHORT" />
-    <envs />
     <option name="isRedirectInput" value="false" />
     <option name="redirectInputPath" value="" />
     <method v="2">