Add snapcraft & chocolatey manifests and move code to src

src/YesNt.Interpreter/Enums/Priority.cs

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+namespace YesNt.Interpreter.Enums;
+
+/// <summary>
+/// Controls the execution order of statements. Lower values run first.
+/// </summary>
+public enum Priority
+{
+    /// <summary>Runs before all other statements. Used for syntax pre-processing such as string literals.</summary>
+    PreProcessing,
+
+    /// <summary>Runs very early. Used for inline substitutions such as variable reads and parameter pops.</summary>
+    Highest,
+
+    /// <summary>Runs early.</summary>
+    VeryHigh,
+
+    /// <summary>Runs above normal order.</summary>
+    High,
+
+    /// <summary>Default execution order.</summary>
+    Normal,
+
+    /// <summary>Runs below normal order.</summary>
+    Low,
+
+    /// <summary>Runs last. Used for control-flow and variable definitions that depend on substitutions being complete.</summary>
+    VeryLow
+}

src/YesNt.Interpreter/Enums/SearchMode.cs

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+namespace YesNt.Interpreter.Enums;
+
+/// <summary>
+/// Determines where in a source line the interpreter searches for a statement keyword.
+/// </summary>
+public enum SearchMode
+{
+    /// <summary>The keyword must appear at the beginning of the line.</summary>
+    StartOfLine,
+
+    /// <summary>The keyword must appear at the end of the line.</summary>
+    EndOfLine,
+
+    /// <summary>The keyword may appear anywhere in the line.</summary>
+    Contains,
+
+    /// <summary>The entire line must exactly match the keyword.</summary>
+    Exact
+}

src/YesNt.Interpreter/Enums/SpaceAround.cs

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+namespace YesNt.Interpreter.Enums;
+
+/// <summary>
+/// Specifies which sides of a statement keyword must be surrounded by a space when matching.
+/// </summary>
+public enum SpaceAround
+{
+    /// <summary>A space is required both before and after the keyword.</summary>
+    StartEnd,
+
+    /// <summary>A space is required before the keyword only.</summary>
+    Start,
+
+    /// <summary>A space is required after the keyword only.</summary>
+    End,
+
+    /// <summary>No surrounding spaces are required.</summary>
+    None
+}