Fix conan create on Windows

Summary

Fixes:

• #101 (closed)
• #102 (closed)
• #103 (closed)

Creating the conan package and installing on Windows had some issues. This MR fixes that.

Focus

• conan create now works on Windows without errors (e.g. via .\make.ps1 conan-create)
• cmake --install results in output files being installed to %appdata%\LinkAhead, e.g. C:\Users\Joscha\AppData\Roaming\LinkAhead

Test Environment

Regular

Check List for the Author

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
  • How do I use the software? Assume "stupid" users.
  • How do I develop or debug the software? Assume novice developers. ~
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

include/linkahead/result_set.h

@@ -40,7 +40,7 @@ class ResultSet {
 
 public:
   virtual ~ResultSet() = default;
-  [[nodiscard]] virtual auto size() const noexcept -> int = 0;
+  [[nodiscard]] virtual auto size() const noexcept -> size_t = 0;
   [[nodiscard]] virtual auto at(const int index) const -> const Entity & = 0;
   [[nodiscard]] virtual auto mutable_at(int index) const -> Entity * = 0;
   /**
@@ -91,7 +91,7 @@ public:
   virtual ~AbstractMultiResultSet() = default;
   inline explicit AbstractMultiResultSet(std::vector<std::unique_ptr<Entity>> result_set)
     : items(std::move(result_set)) {}
-  [[nodiscard]] inline auto size() const noexcept -> int override { return this->items.size(); }
+  [[nodiscard]] inline auto size() const noexcept -> size_t override { return this->items.size(); }
   [[nodiscard]] inline auto at(const int index) const -> const Entity & override {
     return *(this->items.at(index));
   }