Revert "Consolidate Checksum classes into own package"

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Author: rock3r

app/src/main/java/net/squanchy/support/lang/Func0.java

@@ -0,0 +1,6 @@
+package net.squanchy.support.lang;
+
+public interface Func0<V> {
+
+    V call();
+}

app/src/main/java/net/squanchy/support/lang/Func1.java

@@ -0,0 +1,6 @@
+package net.squanchy.support.lang;
+
+public interface Func1<T, R> {
+
+    R call(T t);
+}

app/src/main/java/net/squanchy/support/lang/FunctionalInterfaces.kt

@@ -0,0 +1,5 @@
+package net.squanchy.support.lang;
+
+public interface Predicate<T> extends Func1<T, Boolean> {
+    // Just a convenience subclass of Func1
+}