Fix menu multiline strings

[alandtse]

Right now, the imgui menu handle multiline text by using multiple text fields. This actually is bad as it will break wrapping depending on window size.

ImGui::Text("The Shader Cache is the collection of compiled shaders which replace the vanilla shaders at runtime.");
ImGui::Text("Clearing the shader cache will mean that shaders are recompiled only when the game re-encounters them.");
ImGui::Text("This is only needed for hot-loading shaders for development purposes.");

The better solution is to change to a multiline text string. Note extra space at end after period. This will allow proper word wrapping.

ImGui::Text(
"The Shader Cache is the collection of compiled shaders which replace the vanilla shaders at runtime. " 
"Clearing the shader cache will mean that shaders are recompiled only when the game re-encounters them. "
"This is only needed for hot-loading shaders for development purposes."
);

[rjwignar]

I would like to work on this issue.

I took a look at Menu.cpp and noticed there are some paragraphs where this has already been done, such as:

skyrim-community-shaders/src/Menu.cpp

Lines 361 to 365 in b105489

	ImGui::Text(
	"Hide or show the shader failure message. "
	"Your installation is broken and will likely see errors in game. "
	"Please double check you have updated all features and that your load order is correct. "
	"See CommunityShaders.log for details and check the NexusMods page or Discord server. ");

and

skyrim-community-shaders/src/Menu.cpp

Lines 513 to 515 in b105489

	ImGui::Text(
	"Number of threads to use to compile shaders. "
	"The more threads the faster compilation will finish but may make the system unresponsive. ");

I noticed in the above two snippets, the final sentences also have an extra space after the period, which isn't present in the multiline text string example provided:

Is the extra space also required in the last sentence for proper word wrapping?

[alandtse]

Awesome. No it's not required for the final string, it's just a habit. The reason it's required in the other strings is cpp will concatenate two strings together. So "This is" "a sentence" will end up as "This isa sentence".

[rjwignar]

I've added my changes to #119.
I modified the tooltips that use multiple text fields (tooltips for the Clear Shader Cache and Clear Disk Cache buttons).
I also modified the spacing in the Test Interval slider tooltip.

I noticed the following tooltips that were multi-sentenced but already in one text field, but did not modify them:

• Enable Async checkbox tooltip
• Dump Shaders checkbox tooltip
• Log Level combo box tooltip
• Shader Defines tooltip

I've made a note of these tooltips in the above Pull Request.

Should these tooltips also be modified?